S-91853A037 7/8"-9 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through cotter pin locking mechanism that prevents loosening in high-stress applications
• Excellent corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
• Reliable fastening security with Class 2B thread fit ensuring precise engagement and consistent clamping force
• Easy installation and removal using standard wrenches thanks to the external hex drive design
• Optimized for industrial safety with castle slot design accommodating 5/32" cotter pins for positive mechanical locking
• Environmental compliance assurance meeting both REACH and RoHS 3 standards for workplace and environmental safety
• Durable construction with 1 5/16" width and 29/32" height providing substantial bearing surface for heavy-duty applications

Professional Applications & Engineering Value

This 7/8"-9 UNC locknut delivers critical safety and reliability in demanding industrial environments where vibration-induced loosening poses significant risks. The 18-8 stainless steel construction provides inherent corrosion resistance, making it ideal for outdoor equipment, marine applications, and chemical processing facilities where moisture and corrosive elements are present. The castle nut design with cotter pin locking mechanism offers a fail-safe fastening solution for rotating assemblies, agricultural machinery, automotive suspensions, and construction equipment. The coarse UNC thread pattern ensures quick assembly and disassembly while maintaining secure connections in high-vibration scenarios. This external hex locknut combines mechanical reliability with material durability to solve critical fastening challenges where safety and long-term performance are paramount considerations.

Specification Summary & Compliance

This heavy-duty locknut features 7/8"-9 UNC coarse threads with Class 2B thread fit for precise dimensional accuracy and reliable performance. The manufacturing complies with standard inch system specifications, featuring a 1 5/16" width across flats and 29/32" height with cotter pin slot dimensions of 0.25" minimum depth and 0.18" minimum width to accommodate standard 5/32" cotter pins. The product is fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations, ensuring safe use across various industrial applications while meeting international standards for hazardous substance restrictions.